I'm pretty sure it all depends on how powerful and overused certain clans are, because that's almost always a sign of imbalance. Right now there don't seem to be clans that are OP(tho' I wouldn't mind if Mona would rot in hell) so the staff don't really have reason to change the banlist.

They are probably gonna spend more time making weak clans more playable and creating replacements for banned cards rather then nerf the more powerful ones or release the beasts.